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* [Bug c++/105882] New: A possible constexpr bug
@ 2022-06-08 7:10 zhonghao at pku dot org.cn
2022-06-08 7:16 ` [Bug c++/105882] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: zhonghao at pku dot org.cn @ 2022-06-08 7:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105882
Bug ID: 105882
Summary: A possible constexpr bug
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
The code sample is as follows:
#include <complex>
struct real128
{
__float128 m_value;
template <typename T>
constexpr bool get(T &rop) const
{
using value_type = typename T::value_type;
rop.real(static_cast<value_type>(m_value));
rop.imag(static_cast<value_type>(0));
return true;
}
};
constexpr auto fappo(real128 x)
{
std::complex<double> ret{1,2};
x.get(ret);
return ret;
}
constexpr auto flap = fappo(real128{4});
gcc rejects this code, but clang accepts it. mp++ is a library for
multiprecision arithmetic. Its programmers disable several code lines, when gcc
compiles this project. Please check:
https://github.com/bluescarni/mppp/commit/628651b9928e35dc09c0c2de3d2561abababb55f
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/105882] A possible constexpr bug
2022-06-08 7:10 [Bug c++/105882] New: A possible constexpr bug zhonghao at pku dot org.cn
@ 2022-06-08 7:16 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-06-08 7:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105882
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 88174.
*** This bug has been marked as a duplicate of bug 88174 ***
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-06-08 7:10 [Bug c++/105882] New: A possible constexpr bug zhonghao at pku dot org.cn
2022-06-08 7:16 ` [Bug c++/105882] " pinskia at gcc dot gnu.org
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